I use the 10 Yard 50/200 yard zero. Target at 10 yards. Point of and aim and point of impact after adjusting iron sights or optics 1.9" inches below point of aim. You are now zeroed at 50 and 200 yards but shooting at 10 yards. If you want a 100 yard zero shooting at 10 yards its approximately 2.0-2.1 inches below point of aim. Hornady has a free ballistics calculator online or phone app that will do G1 and G7 models that's fairly accurate but is based on their ammunition.